Trisazo dye.



pire, residingr at Leverkusen, near Cologne,

i0 and production of new trisazo dyestuffs capaproduce intermediate compounds which can a different amin may .be used), rediazotizing .sition to the non-substituted amino group shape ol their alkaline salts dark powders I being formed.

ton generally 'from violet to blue shades.

nniran s'rnrissearenr engeren.

HEINRICH JORDAF( AND WILHELM NEELMEIER, OF LEVERKUSEN, NEAR COLOGNE, GER- MANY, ASSIGNORQ TO FARBEIFABRIKEN VORM. FRIEDR. BAYER L GO., OF .ELBERFELD, GERMANY, OOP PORATION OF GERMANY.

TnIsAho DYE.

To all whom it 'may concern.'

ie it known that we, HEINRien JORDAN and Vi'lLnnLM Nianmnunn, doctors of philosophy, chemists, citizens of the German Eni- Germany, have invented new and useful lmprovements in new Trisazo Dye, of which tli'e JfollowingT is a specification.

Our invention relates to the manufacture `ble of dyeing uninordanted cotton. The process for their production consists in combining diazo compounds of the benzene or naphthalene series with suitable amins to be -further diazotized, diazotizing the inter mediate compounds thus obtained and come bining the diazoazo compounds thus produced again with suitable amins (the saine or the disazo dyestui'ls thus obtained and then combining them with one molecule of a lnonoacidylif/,ed nieta-diamin in which the hydrogen in the benzene nucleus in para po has not been replaced by other groups e. g. -1acetyl-a1nino-2-a1ninotoluene, 4i-yacetylamimiQ-arninoanisol, l-Inenoaeetyl-amino-3- aminobenzenq dacetylaniino-Q-aminobenp iienet'ol, 4-acetylaminoZamino-1-chloro l'wnzene, l-acetylamino-amino-lphenyl other etc.

The new dyestus thus obtained are in the solu ble in water. Upon reduction with zinc dust and acetic acid they are decomposed ain'ins, diamins and monoacidylized trianiins They dye unmordanted cot- ."lhe dyes can be diazotized on the fiber and further combined with amins or phenols. If, for instance combined with beta-naphthol, they generally produce pure blue shades fast charged with hydrosulfites leave white.

u [n order lo carry out this process we can e. g., proceed :is follows, the parts being by il, PU TQ lnxainple: 173 parts of ortho-sulfanilic Specification of Letters Patent.

Application filed January 28,

acid are diazotized in the usual way and the resulting'dmzo ronnnmind is added to 223 l parts ol l-naphthylaniin--siii'fonic acid bel Istented May 4, 1909.

1909. Serial No. '474,803.

ing,r suspended in water. After the addition of sodium acetate to neutralize the free mineral acid it is stirred until the combination is liniShcd. Suliisequentlj! the mass of the reaction is acidulated with 35() parts of hydrochloric acid (19 B.) and the aminoazo compound is diazotized bj-f means of 69 parts of sodium nitrite. The diazo compound separates partly, .it is completely precipitated by the addition of common salt and filtered oilq and is then stirred up with water to a paste andadded at 10 C. to a solution of 223 parts of 1-ninihthylarnin-7-siilfonic acid containing an excess of sodium carbonatc. When the reaction is iinished the dye-v stu' is salted out and 'liltered off. After resolution in water it is diazotized at 09 C. by. adding,r to the solutiona solution of 69 parts oi sodiumnitrite and then by acidulation with hydrochloric acid. The diazo coinpound separates as a black precipitate which is filtered oil, stirred up with ice water and combined with a solution of 180 parts of /t-acetylainino-2aminoanisol in hydrochloric acid and sodium acetate isadded to neutralize the free mineral acifd. The d'yestuffseparates. Sodium carbonate is thenl added` to render the mixture alkaline and the dyestu'f is salted out andiltered oil. It is, after beingE dried and pulverized, in the shape of its sodium salt a dark powder soluble in water with a Violet color and soluble in concentrated sulfuric acid with a blue color. By reduction with zinc dust and acetic acid, ortho-sulfanilic acid, diai'ninonaphthalene-6 and 7-sulfonic acid and lacetyl amino 3 .6 diainino 4 methoxybenzene are obtained. lt dyes umniordanted cotton reddish-blue shades, and produces, when diazotizcd on the fiber and combined with beta-naphthol, pure greenish-blue.

shades fast to washing and to light, which can .be discharged 'pure white with hydrosulfite.

The process is carried out in an'analogous manner on using other diazo compounds as initial components e. g. meta-sulfauilic acid, anilin-2.fl-disulfonic acid, 4-chloranilin2- or B-sulfonic acid, aniinosullos'alicylic acid, 2- naphthylainin-l.8- or 5.7-disullionic acid, 1- naphthylarnin 4.8 disulfonic acid, other amins as middle con'i'ponents, such as the naphthylamins, cresidins, Xylidins or other of the above mentioned end comi-ments.

' yielding upon" reduction with zinc dust and acetic acid arnlns, diannns' and acidyl-trldried and pulverized, in the shape of their 'f l shades; which after diazotation. onthe iiber .,suliite a pure white, substantially as .described.

Two different middle components may be used e. g. alpha-na hthylarnin and l-naphthylaminor 7-suliiionic acid.

Having now described our invention and in what manner the same is to be performed, what We clain'ras new and desire to secure by Letters Patent is 1. The herein-described new trisazo. dyestu's obtainable from amins, two middle components and Inonoacidylized meta-diamins in which the hydrogen in the benzene nucleus in para position to the non-substi` tuted amino group has not been replaced by other groups, which dyestus'are, after being alkaline salts dark powders soluble in Water',`

amins, and dyeing cotton from violet to blue and combination with beta-napllthol gener-1 ally change into blue shades fast to Washing leaving after being discharged with hydro- 2. The herein-described new azo dyestuff which can be obtained from ortho-sulfanilic acid, 1-naphthylamin--sulfonic acid, 1- naphthylamin-7-sulfonic acid and L1acetylamino-Z-aminoanisol, which dyestuil is, after being dried and pulverized, in the shape of its sodiuln salt a dark owder which is soluble in water with a vio et color, and which is soluble in concentrated sulfuric acid with a blue color; yielding upon reduction with Zinc dust and acetic acid, ortlio-sulfanilic acid, dianiinonaphthalene-G- and 7-sulfonic acid and 1acetylaniino-S.6diarnino-4-InetlioxyJ benzene; dyeing cotton reddish-blue shades -which after diazotation on the fiber and combination with` beta-naplzthol change into pure greenish-blue shades fast to washing and leaving after being discharged with. hydrosulfite a pure white, 'substantially as described.

In testimony whereof we have hereunto set our lands in t-.e 'presence of two subscribing Witnesses.

HEINRICH JOL-DAN. [L s] WILHELM NEELMEIER.- [L s] Witnesses z OTTO KNIG,

WM. WASHINGTON BRUNSWICK. 

